CN111426915B - Distributed small current ground fault positioning method - Google Patents
Distributed small current ground fault positioning method Download PDFInfo
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- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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- G01R31/08—Locating faults in cables, transmission lines, or networks
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- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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Abstract
The application discloses a distributed small-current ground fault positioning method which models a topological query result of a distributed fault positioning system according to a matrix theory and utilizes a topological description matrix to reflect corresponding positions among nodes in a control domain. Transient state zero sequence voltage and zero sequence current signals of each terminal acquisition node are utilized to calculate a transient state reactive power direction, and a fault information matrix is formed; and finally, combining the topology description matrix and the fault information matrix to form a fault judgment matrix, and determining the section where the fault is located by applying a fault unified criterion. The method utilizes the advantages of small and visual matrix theoretical calculated amount and the like to realize effective fusion of the line topology and the fault information, is suitable for a control mode combining master-slave control or master-slave and cooperative control, improves the speed of finding the fault path, effectively solves the fault positioning blind areas of T-shaped wiring positions and tail end faults of the distribution line and the like, and accordingly improves the accuracy of the distributed low-current grounding fault positioning of the power distribution network.
Description
Technical Field
The application relates to the technical field of electricity, in particular to a distributed small-current ground fault positioning method.
Background
The neutral point of a middle-low voltage distribution network of 10kV or below in China is widely operated in an ungrounded mode or an arc suppression coil grounded mode, a fault signal is weak and is difficult to detect when a single-phase (low-current) ground fault occurs, the single-phase ground fault occurs at a high frequency, and the small-current ground fault is positioned to be a great technical problem of fault treatment of the distribution network due to the reasons of numerous branches of the distribution network, random load distribution and the like.
At present, a small-current ground fault positioning method mainly comprises a centralized type FA (feeder automation) and an in-place type FA, wherein the in-place type FA is divided into a recloser type FA and an intelligent distributed type FA, and the intelligent distributed type FA becomes a research hotspot by virtue of the advantages of less participation links, high action speed, independence of a main station and the like.
The intelligent distributed control method mainly comprises cooperative control and master-slave control, wherein the master-slave control mode is that a master control terminal receives fault information uploaded from a slave terminal in a control domain, and a fault section is judged by combining a line topological structure, but how to effectively fuse the line topological structure and the fault information has important significance for improving the fault positioning speed and accuracy in the master-slave control mode.
Disclosure of Invention
The application provides a distributed small-current grounding fault positioning method to solve the technical problem of judging a power grid fault section.
In order to solve the technical problem, the embodiment of the application discloses the following technical scheme:
the embodiment of the application discloses a distributed small current ground fault positioning method, which comprises the following steps:
establishing a topology description matrix for a topology query result of the distributed fault positioning system according to a matrix theory;
acquiring zero-sequence voltage and zero-sequence current signals of each node;
calculating the transient reactive power direction of each node by using the zero sequence voltage and the zero sequence current;
establishing a fault information matrix by using the transient reactive power direction;
obtaining a fault judgment matrix by using the fault information matrix and the topology description matrix;
and determining the section where the fault is located by using the fault judgment matrix and the fault unified criterion.
Optionally, establishing a topology description matrix for the topology query result of the distributed fault locating system according to a matrix theory, including:
performing line topology query on the distributed fault positioning system to obtain a topology query result;
according to the topology query result, all slave terminals are taken as nodes, address information of all the nodes is uniformly coded, and meanwhile, the positive direction from a power supply node to all end nodes is set;
a topology description matrix D is established that,if there are n lines of nodes, an n × n square matrix is constructed, matrix Dn×nElement d in (1)ijThe definition is as follows:
optionally, the obtaining the transient reactive power direction of each node by using the zero-sequence voltage and the zero-sequence current includes:
and comparing the zero sequence voltage with a preset threshold value.
And if n-1 zero sequence voltage amplitudes of n continuous nodes are larger than the threshold value, the transient reactive power direction of each node is calculated by using the zero sequence voltage and the zero sequence current. The successive nodes indicate that current flows along each node in turn, where n ≧ 3.
Otherwise, returning to collect zero sequence voltage and zero sequence current signals of each node.
Optionally, the process of calculating the transient reactive power direction of each node by using the zero-sequence voltage and the zero-sequence current is as follows:
filtering the transient state quantity of the zero sequence voltage and the zero sequence current, and extracting a zero sequence voltage transient state signal and a zero sequence current transient state signal in a preset frequency band;
calculating the transient reactive power of each node by using the zero-sequence voltage transient signal and the zero-sequence current transient signal;
and calculating the transient reactive power direction by using the transient reactive power.
Optionally, the obtaining the transient reactive power direction of each node by using the zero-sequence voltage and the zero-sequence current includes:
comparing the zero sequence voltage with a preset threshold value;
if n-1 zero sequence voltage amplitudes of n continuous nodes are larger than the threshold value, the transient state reactive power direction of each node is obtained by using the zero sequence voltage and the zero sequence current;
otherwise, returning to collect zero sequence voltage and zero sequence current signals of each node.
Optionally, a calculation process of calculating a transient reactive power direction of each node by using the zero-sequence voltage and the zero-sequence current is as follows:
filtering the transient state quantity of the zero sequence voltage and the zero sequence current, and extracting a zero sequence voltage transient state signal and a zero sequence current transient state signal in a preset frequency band;
calculating the transient reactive power of each node by using the zero-sequence voltage transient signal and the zero-sequence current transient signal;
and calculating the transient reactive power direction by using the transient reactive power.
Optionally, the calculation formula for calculating the transient reactive power of each node is as follows:
in formula (2): smIs the transient reactive power of node m; u. of0Transient zero sequence voltage of a node m;
is u0(t) a Hilbert transform; and T is the transient process data length.
Optionally, the transient reactive power is used to calculate a transient reactive power direction, and a calculation formula is as follows: qm＝signSm(3) In the formula (3), SmThe transient reactive power.
Optionally, the preset frequency band is: 2 kHz-100 kHz.
Optionally, the preset threshold is:
UOD＝KrelU0 (1)
in the formula (1), KrelIs a reliability factor; u shape0Is the effective value of the zero sequence voltage flowing through the node.
Compared with the prior art, the beneficial effects of this application do:
the embodiment of the application discloses a distributed small-current ground fault positioning method, which models a topological query result of a distributed fault positioning system according to a matrix theory and reflects corresponding positions among nodes in a control domain by using a topological description matrix. Transient state zero sequence voltage and zero sequence current signals of each terminal acquisition node are utilized to calculate a transient state reactive power direction, and a fault information matrix is formed; and finally, combining the topology description matrix and the fault information matrix to form a fault judgment matrix, and determining the section where the fault is located by applying a fault unified criterion. The method utilizes the advantages of small and visual matrix theoretical calculated amount and the like to realize effective fusion of the line topology and the fault information, is suitable for a control mode combining master-slave control or master-slave and cooperative control, improves the speed of finding the fault path, effectively solves the fault positioning blind areas of T-shaped wiring positions and tail end faults of the distribution line and the like, and accordingly improves the accuracy of the distributed low-current grounding fault positioning of the power distribution network.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
In order to more clearly explain the technical solution of the present application, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious to those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a flowchart of a distributed small-current ground fault location method according to an embodiment of the present disclosure;
fig. 2 is a schematic diagram of a feeder structure according to an embodiment of the present application.
Detailed Description
In order to make those skilled in the art better understand the technical solutions in the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments in the present application without making any creative effort shall fall within the protection scope of the present application.
The distributed fault positioning system based on the master-slave control mode is realized by a line monitoring terminal, a communication network and a power distribution automation master station. The line outlet terminal serves as a master control terminal, other line terminals serve as slave terminals, and the line monitoring terminal mainly comprises a power distribution automation terminal, a fault indicator and the like.
Referring to fig. 1, an embodiment of the present application provides a distributed small-current ground fault location method, including:
s100: and establishing a topology description matrix for the topology query result of the distributed fault positioning system according to the matrix theory.
And carrying out line topology query on the distributed fault positioning system to obtain a topology query result. And according to the topology query result, all the slave terminals are taken as nodes, the address information of all the nodes is uniformly coded, and meanwhile, the positive direction from the power supply node to all the tail end nodes is set.
Establishing a topology description matrix D, if a lines of nodes exist, constructing an a multiplied by a square matrix, and establishing the matrix Da×aElement d in (1)ijThe definition is as follows:
s200: and collecting zero sequence voltage and zero sequence current signals of each node. And each slave terminal in the master-slave control mode distributed fault positioning system acquires a zero-sequence voltage signal and a zero-sequence current signal of a corresponding node.
S300: and solving the transient reactive power direction of each node by using the zero sequence voltage and the zero sequence current.
And comparing the zero sequence voltage with a preset threshold value. Wherein the preset threshold is:
UOD＝KrelU0 (1)
in the formula (1), KrelIs a coefficient of reliability；U0Is the effective value of the zero sequence voltage flowing through the node.
And if n-1 zero sequence voltage amplitudes of n continuous nodes are larger than the threshold value, the transient reactive power direction of each node is calculated by using the zero sequence voltage and the zero sequence current. Otherwise, returning to collect zero sequence voltage and zero sequence current signals of each node. Wherein n is more than or equal to 3.
The specific process of calculating the transient reactive power direction of each node by using the zero-sequence voltage and the zero-sequence current comprises the following steps: and filtering the transient quantities of the zero-sequence voltage and the zero-sequence current, and extracting a zero-sequence voltage transient signal and a zero-sequence current transient signal in a preset frequency band.
And calculating the transient reactive power of each node by using the zero-sequence voltage transient signal and the zero-sequence current transient signal, wherein the calculation formula is as follows:
in formula (2): smIs the transient reactive power of node m; u. of0Transient zero sequence voltage of a node m;
is u0(t) a Hilbert transform; and T is the transient process data length.
And calculating the transient reactive power direction by using the transient reactive power, wherein the calculation formula is as follows: qm＝signSm(3),
In the formula (3), SmThe transient reactive power.
S400: and establishing a fault information matrix by utilizing the transient reactive power direction, wherein the definition of the fault information matrix G is as follows:
G＝Diag[Qm] (4)。
s500: and obtaining a fault judgment matrix by using the fault information matrix and the topology description matrix. Adding the fault information matrix and the topology description matrix to obtain: p ═ D + G.
S600: and determining the section where the fault is located by using the fault judgment matrix and the fault unified criterion.
The unified fault criterion is as follows:
a: when p isii＝-1，p ij1 and pjjWhen 1, the fault is located between node i and node j.
B: when p isii＝-1，pij＝1，pikWhen the number is equal to 1, the alloy is put into a container,
if p isjj＝1，p kk1, the fault is located between nodes i, j, k (at the T-type node);
if p isjj＝1，pkkWith-1, the fault is located downstream of node k.
C: if p is satisfied in the fault finding pathiiThe fault is located downstream of the path's last node, which is-1.
The present application also provides an example to facilitate a more intuitive understanding of the present application.
As shown in fig. 2, this example provides a schematic diagram of a feeder architecture.
(1) Building topology description matrices
(2) Fault information matrix under different fault positions
Point k1 failure: g ═ Diag [ -1, -1,1, -1,1 ];
point k2 failure: g ═ Diag [ -1, -1,1,1,1 ];
point k3 failure: g ═ Diag [ -1, -1, -1,1,1 ];
(3) and (3) corresponding to the fault judgment matrix:
k1：
k2：
k3：
(4) determining a fault section by utilizing a fault unified criterion:
point k1 failure: starting the search from the power supply node, p11＝-1，p12＝1，p22Continue looking up to 2 node neighbor, p ═ 123＝1，p 331, but because of p24＝1，p44-1, so that the criterion 2 is fulfilled the search continues towards the node 4 neighbor, p45＝1，p55Criterion a is fulfilled, so the fault is located between node 4 and node 5.
Point k2 failure: starting the search from the power supply node, p11＝-1，p12＝1，p22Continue looking up to 2 node neighbor, p ═ 123＝1，p 331, simultaneously, p24＝1，p44The criterion B is met so the fault is located between nodes 2, 3, 4, 1.
Point k3 failure: starting the search from the power supply node, p11＝-1，p12＝1，p22Continue looking up to 2 node neighbor, p ═ 123＝1，p33Is-1, simultaneously, p24＝1，p44If 1, the criterion B is satisfied and the search continues towards the node 3 neighbor node, but node 3 is the end node and each node in the path for the fault is-1, so the fault is downstream of end node 3.
The embodiment of the application discloses a distributed small-current ground fault positioning method, which models a topological query result of a distributed fault positioning system according to a matrix theory and reflects corresponding positions among nodes in a control domain by using a topological description matrix. Transient state zero sequence voltage and zero sequence current signals of each terminal acquisition node are utilized to calculate a transient state reactive power direction, and a fault information matrix is formed; and finally, combining the topology description matrix and the fault information matrix to form a fault judgment matrix, and determining the section where the fault is located by applying a fault unified criterion. The method realizes effective fusion of the line topology and the fault information by utilizing the advantages of small and visual matrix theoretical calculated amount and the like, is suitable for a control mode combining master-slave control or master-slave and cooperative control, improves the speed of searching a fault path, effectively solves fault positioning blind areas of T-shaped wiring positions and tail end faults of the distribution line and the like, and accordingly improves the accuracy of positioning the distributed small-current grounding fault of the distribution network.
Since the above embodiments are all described by referring to and combining with other embodiments, the same portions are provided between different embodiments, and the same and similar portions between the various embodiments in this specification may be referred to each other. And will not be described in detail herein.
It is noted that, in this specification, relational terms such as "first" and "second," and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a circuit structure, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such circuit structure, article, or apparatus. Without further limitation, the presence of an element identified by the phrase "comprising an … …" does not exclude the presence of other like elements in a circuit structure, article or device comprising the element.
Other embodiments of the present application will be apparent to those skilled in the art from consideration of the specification and practice of the disclosure herein. This application is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the application being indicated by the following claims.
The above-described embodiments of the present application do not limit the scope of the present application.
Claims (7)
1. A distributed small current ground fault positioning method is characterized by comprising the following steps:
establishing a topology description matrix for a topology query result of the distributed fault positioning system according to a matrix theory, and performing line topology query on the distributed fault positioning system to obtain a topology query result;
according to the topology query result, all slave terminals are taken as nodes, address information of all the nodes is uniformly coded, and meanwhile, the positive direction from a power supply node to all end nodes is set;
establishing a topology description matrix D, if a line with n nodes exists, constructing an n multiplied by n square matrix, and the matrix Dn×nElement d in (1)ijThe definition is as follows:
acquiring zero-sequence voltage and zero-sequence current signals of each node;
calculating the transient reactive power direction of each node by using the zero sequence voltage and the zero sequence current;
establishing a fault information matrix by using the transient reactive power direction;
obtaining a fault judgment matrix by using the fault information matrix and the topology description matrix;
and determining the section where the fault is located by using the fault judgment matrix and the fault unified criterion.
2. The distributed small-current ground fault location method of claim 1, wherein using the zero-sequence voltage and the zero-sequence current to find the transient reactive power direction of each node comprises:
comparing the zero sequence voltage with a preset threshold value;
if n-1 zero sequence voltage amplitudes of n continuous nodes are larger than the threshold value, the transient state reactive power direction of each node is obtained by using the zero sequence voltage and the zero sequence current;
otherwise, returning to collect zero sequence voltage and zero sequence current signals of each node.
3. The distributed small-current ground fault location method according to claim 2, wherein the calculation process for obtaining the transient reactive power direction of each node by using the zero-sequence voltage and the zero-sequence current comprises:
filtering the transient state quantity of the zero sequence voltage and the zero sequence current, and extracting a zero sequence voltage transient state signal and a zero sequence current transient state signal in a preset frequency band;
calculating the transient reactive power of each node by using the zero-sequence voltage transient signal and the zero-sequence current transient signal;
and calculating the transient reactive power direction by using the transient reactive power.
4. The distributed small-current ground fault location method according to claim 3, wherein the calculation formula for the transient reactive power of each node is:
in the formula (2): smIs the transient reactive power of node m; u. u0Transient zero sequence voltage of a node m;
is u0(t) a Hilbert transform; and T is the transient process data length.
5. The distributed small-current ground fault location method according to claim 4, wherein the transient reactive power is used to calculate a transient reactive power direction, and the calculation formula is as follows: qm＝signSm (3),
In the formula (3), the reaction mixture is,Smthe transient reactive power.
6. The distributed small-current ground fault location method according to claim 3, wherein the preset frequency band is: 2 kHz-100 kHz.
7. The distributed small-current ground fault location method according to claim 2, wherein the preset threshold is:
UOD＝KrelU0 (1)
in the formula (1), KrelIs a reliability factor; u shape0Is the effective value of the zero sequence voltage flowing through the node.
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| CN113219298B (en) * | 2021-03-24 | 2022-10-11 | 昆明理工大学 | Fault current traveling wave numerical simulation method for complex alternating current power grid |
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